"Se Vende" () is a song recorded by the Spanish singer-songwriter Alejandro Sanz. The song serves as second single for Sanz's ninth studio album La Música No Se Toca (2012). It was released for digita
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fe93de308dc548f7c98ad849f5adbb2d30a4f1a4fa524696e322e474a54d03. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ac7c477-03cf-45a0-808f-638575b912d2.json and https://artists.proofprofile.net/proofs/artist/4ac7c477-03cf-45a0-808f-638575b912d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).